Quotes in links make Cairo crash

[liZe]

When trying to render

<a href="'">

we get cairocffi.CairoError: cairo returned CAIRO_STATUS_TAG_ERROR: b'invalid tag name, attributes, or nesting'.

[Northshoot]

getting same error

cairocffi.CairoError: cairo returned CAIRO_STATUS_TAG_ERROR: b'invalid tag name, attributes, or nesting'

[liZe]

getting same error

This error can appear for different reasons. You can try the current master branch and see if it fixes your problem.